EP2704398A1 - Verfahren zur Inhaltsänderungsmitteilung in einem Cloud-Speichersystem, zugehöriger Cloud-Broker und Cloud-Agent - Google Patents

Verfahren zur Inhaltsänderungsmitteilung in einem Cloud-Speichersystem, zugehöriger Cloud-Broker und Cloud-Agent Download PDF

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Publication number
EP2704398A1
EP2704398A1 EP12181883.5A EP12181883A EP2704398A1 EP 2704398 A1 EP2704398 A1 EP 2704398A1 EP 12181883 A EP12181883 A EP 12181883A EP 2704398 A1 EP2704398 A1 EP 2704398A1
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EP
European Patent Office
Prior art keywords
content
cloud
change notification
broker
applications
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12181883.5A
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English (en)
French (fr)
Inventor
Veselin Pizurica
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Awingu NV
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Awingu NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Awingu NV filed Critical Awingu NV
Priority to EP12181883.5A priority Critical patent/EP2704398A1/de
Priority to US14/010,848 priority patent/US20140059217A1/en
Publication of EP2704398A1 publication Critical patent/EP2704398A1/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/562—Brokering proxy services

Definitions

  • the present invention generally relates to real-time notification of content changes in a cloud storage environment where different applications simultaneously share the same content.
  • a user or multiple users can use different applications on one or multiple devices to simultaneously read or change the content.
  • Changing content in the context of the current patent application comprises creating or rendering, moving, updating or editing, copying, and deleting a file, object, directory or subdirectory stored in a cloud storage system.
  • a cloud storage system is a networked pool of storage resources, e.g. web servers located in one or several data centers, operated and hosted by a third party different from the user, e.g. a data center operator.
  • asynchronous notification of content changes is required.
  • the WebDAV protocol defined in Internet Engineering Task Force (IETF) RFC 4918 provides a framework for users to change content stored on a web server.
  • the WebDAV or Web Distributed Authoring and versioning protocol is an extension of the HyperText Transfer protocol (HTTP) that facilitates collaboration between users in editing and managing documents and files stored on web servers.
  • HTTP HyperText Transfer protocol
  • the most important features of the WebDAV protocol include creation, removal and querying file information. This way, the WebDAV protocol has made the web a readable and writable medium.
  • the WebDAV protocol however does not foresee asynchronous notification in case a file has changed as a result of an action of different users of that file, or in case the same user accesses a file through different applications running on one or plural devices.
  • Dropbox app is an existing application that supports asynchronous notification of file changes.
  • the Dropbox app triggers a re-synchronization protocol for file updates with the different users.
  • the Dropbox app is limited to one particular application, i.e. Dropbox. In other words, it does not allow notification across different applications that share the same content over cloud infrastructure.
  • the above defined objectives are realized by the method for notification of content changes across different applications that share same content in a cloud storage system defined by claim 1, the method comprising:
  • a cloud IO broker i.e. a server that keeps track of the applications that require change notifications and the exact content for which these applications require change notification.
  • Each cloud IO broker shall inform a cloud IO agent, i.e. an application which runs in the cloud data center, on the content for which it desires to receive change notifications.
  • a cloud IO broker informs the cloud IO agent on the files, objects and directories for which it needs notification of content change events.
  • the cloud IO agent will monitor the cloud storage system for content changes. Different implementations are possible.
  • the cloud IO agent may permanently scan the registered content for changes or the cloud infrastructure may notify the cloud IO agent of each content change.
  • the cloud IO agent sends a change notification, e.g. a cloud IO event or CMUD (create, move, update or delete) event, to the relevant cloud IO brokers.
  • CMUD create, move, update or delete
  • the cloud IO agent compares files, objects and directories that have changed against the files, objects and directories that were registered for change notification.
  • Each cloud IO broker at last shall multicast the change notification, i.e. the CMUD event, to the relevant applications registered with it.
  • the applications can reside on a single device of a single user, or they can reside on multiple devices from one or more users. It remains the clients responsibility to fetch and interpret the change notification, i.e. the CMUD event, and to render the content change appropriately.
  • the method according to the invention with cloud IO agent monitoring content changes and cloud IO brokers multicasting content changes to applications that register with it for this service allows different applications across different devices and different platforms to receive asynchronous content change notifications in an open and transparent manner.
  • all applications of all users that share content stored in a cloud storage system shall at any point in time have the same presentation or version of the shared content.
  • the method for notification of content changes according to the present invention may further comprise:
  • the cloud IO broker may be implemented with an authentication function allowing to decide whether or not to accept a request for change notification from a client device hosting an application that requires change notification.
  • an authentication function allowing to decide whether or not to accept a request for change notification from a client device hosting an application that requires change notification.
  • a basic HTTP authentication mechanism can be used between the client device and cloud IO broker to establish a trusted connection for the change notification.
  • the second content change notification may be multicasted via HTTP WebSockets or HTTP REST calls.
  • client devices connected to a cloud storage system via the HyperText Transfer Protocol can receive content change notifications in real time by use of HTTP WebSockets or HTTP REST (REpresentational State Transfer) calls.
  • HTTP WebSockets or HTTP REST (REpresentational State Transfer) calls.
  • the content changes that happen in the cloud storage system and that are reported by the cloud IO agent can be propagated as CMUD (create, move, update or delete) events over HTTP to the different applications that are connected at that moment and that have registered for the content change notification service.
  • CMUD create, move, update or delete
  • HTTP REST calls can be used to propagate the CMUD events.
  • the applications may register for content change notification with the cloud IO broker via HTTP POST requests or HTTP WebSocket requests.
  • client devices connected to a cloud storage system via HTTP can subscribe to the content change notification service according to the present invention using an HTTP WebSocket request or an HTTP Post request.
  • the HTTP WebSocket request or HTTP POST request must specify the file, object or directory path, the client ID and the client endpoint.
  • HTTP POST request can be used to register for the content change notification service.
  • the present invention relates to a cloud IO broker as defined by claim 5, the cloud IO broker being adapted to tunnel cloud IO events to/from different client devices in a cloud storage system wherein different applications share same content, the cloud IO broker comprising:
  • the present invention relates to a corresponding cloud IO agent as defined by claim 6, the cloud IO agent being adapted for notification of content changes across different applications that share same content in a cloud storage system, the cloud IO agent comprising:
  • Fig. 1 is a block diagram showing a cloud storage system wherein an embodiment of the method for content change notification according to the present invention is implemented;
  • Fig. 2A and 2B illustrate the message flow for content change notification subscription by two applications in an embodiment of the content change notification method according to the present invention.
  • Fig. 3A, 3B and 3C illustrate the message flow upon a content change in an embodiment of the content change notification method according to the present invention.
  • Fig. 1 shows a block diagram with one client device 101 that has two different applications, APP1 or 111 and APP2 or 112, that are connected to a backend cloud storage system 103.
  • the two applications 111 and 112 share content stored in the cloud storage system 103 and desire to have at each point in time the same presentation of the shared cloud content.
  • the applications 111 and 112 therefore shall subscribe to a content change notification service as will be explained in the following paragraphs. Obviously, there is no limit in the number of devices and/or the number of applications that can subscribe to such service.
  • Fig. 1 further shows a cloud IO broker 102.
  • This cloud IO broker 102 is a server that uses WebSockets or HTTP REST calls to tunnel cloud IO events to the different applications that subscribe for the notification service.
  • the cloud applications 111 and 112 are client software applications or clients that subscribe with cloud IO broker 102 for the cloud IO event notification.
  • a client 111 or 112 can subscribe to the cloud IO event notification either using an HTTP POST request or a WebSocket request. This request is respectively denoted 141 and 142 for the clients 111 and 112 in Fig. 1 , and typically comprises the following data:
  • JavaScript Object Notation or JSON format of the request message 141 for WebSockets is as follows:
  • a client shall receive cloud IO events, 148 and 149 in Fig. 1 .
  • cloud IO event defines a file or directory change by means of a CMUD (create, move, update or delete operation) that happened in the cloud storage system 103.
  • a cloud IO event like 148 and 149 comprises the following data:
  • JavaScript Object Notation or JSON format of the IO event 148 is as follows:
  • the cloud IO broker 102 decides whether or not to accept client requests 141 and 142. Thereto, a basic HTTP authentication can be used between the clients 111, 112 and the cloud IO broker 102 to establish trusted connection.
  • Fig. 1 clients APP1 or 111] and APP2 or 112 running on client device 101 register for the cloud IO event notification service with cloud IO broker 102 via respective requests 141 and 142.
  • Cloud IO broker 102 informs cloud IO agent 133 in cloud storage system 103 about the files and directories for which it needs content change event notification via the message 143.
  • the client application 111 changes the file content in the cloud using the WebDAV protocol, as is indicated by arrow 144.
  • a WebDAV server 131 in the cloud storage system 103 is connected to the files/directories cloud store 132 and implements the file/directory changes therein as is indicated by 145 in Fig. 1 .
  • cloud IO agent 133 is notified of the changes in the backend cloud store 132 via message 146.
  • the cloud IO agent 133 compares the files and directories that have changed against the files and directories that were registered in message 143. In case that some of the files or directories that have changed according to message 146 were registered by clients 111 or 112 for content change notification, the cloud IO agent 133 will notify the cloud IO broker 102 about these changes. This is done via cloud IO event message 147. At last, the cloud IO broker 102 will multicast the content changes as cloud IO events 148 and 149 to both applications 111 and 112 via HTTP WebSocket or HTTP REST calls.
  • Fig. 2A and Fig. 2B show in more detail the message flow to register clients 111 and 112 for content change notification in the system of Fig. 1 .
  • Client applications can subscribe to the cloud IO event notification service either using HTTP POST or HTTP WebSocket requests.
  • client applications 111 and 112 subscribe for the service by respectively sending the request messages REQ_IO_11 or 141 and REQ_IQ_21 or 142 to the cloud IO broker 102. Through these request messages 141 and 142, client applications 111 and 112 request to be notified on the cloud IO events changing specific content.
  • path1 is a path in the WebDAV format pointing to the content for which client 111 requests change notification, e.g. "http://user@host.tld/path/”.
  • request 142 sent from client 112 to cloud IO broker 102: path2, clientID2 and clientendpoint2.
  • path2 is a path in the WebDAV format pointing to the content for which client 112 requests change notification, e.g. "http://user@host.tld/path2/".
  • Cloud IO broker 102 informs the cloud IO agent 103 about the files and paths for which it needs content change notification.
  • this is done for path1 and path2 via the registration messages REG_IO_12 or 143A and REG_IO_22 or 143B.
  • registering the files and directories for which content change notification is required may alternatively be combined into a single message sent from cloud IO broker 102 to cloud IO agent 103, as is indicated by 143 in Fig. 1 .
  • Fig. 3A, Fig. 3B and Fig. 3C show in more detail the cloud IO event handling message flow in the system of Fig. 1 in case of a content change.
  • the client 111 is responsible for the content change on the file or directory stored in the cloud store 132.
  • the client 111 thereto sends IO_CHANGE message 144 to the WebDAV server 131 and specifies therein which file or directory has to be changed.
  • This change will be reported by cloud store 132 to cloud IO agent 133 via IO_CHANGE message 146.
  • the following data is encoded in the IO_CHANGE message 146 sent to cloud IO agent 133: path, time, type, frompath, MD5 and size.
  • path is a path in the WebDAV format pointing to the content that was changed, e.g. "http://user@host.tld/path/"
  • time specifies the time of the content change
  • type indicates the type of content change, i.e. either a create, move, update, copy or delete operation, frompath points to the file location in the cloud storage system prior to the move in case that a file is moved or remains empty otherwise
  • MD5 represents a checksum
  • size specifies the size of the changed file in bytes in case the content change was a file change.
  • the detected cloud IO change will be forwarded through CLOUD_IO_CHANGE1 message 147 towards the cloud IO broker 102.
  • the cloud IO broker 102 will check which client applications are registered for change notification on that file or directory. As a result, it will forward the change as CLOUD_IO_CHANGE2 message 148 to client application 111.
  • a similar message 149 will be forwarded to client application 112 assuming that the content change has taken place on a file or directory that belongs to path2.
  • top, bottom, over, under, and the like are introduced for descriptive purposes and not necessarily to denote relative positions. It is to be understood that the terms so used are interchangeable under appropriate circumstances and embodiments of the invention are capable of operating according to the present invention in other sequences, or in orientations different from the one(s) described or illustrated above.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Information Transfer Between Computers (AREA)
EP12181883.5A 2012-08-27 2012-08-27 Verfahren zur Inhaltsänderungsmitteilung in einem Cloud-Speichersystem, zugehöriger Cloud-Broker und Cloud-Agent Withdrawn EP2704398A1 (de)

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EP12181883.5A EP2704398A1 (de) 2012-08-27 2012-08-27 Verfahren zur Inhaltsänderungsmitteilung in einem Cloud-Speichersystem, zugehöriger Cloud-Broker und Cloud-Agent
US14/010,848 US20140059217A1 (en) 2012-08-27 2013-08-27 Method for content change notification in a cloud storage system, a corresponding cloud broker and cloud agent

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EP12181883.5A EP2704398A1 (de) 2012-08-27 2012-08-27 Verfahren zur Inhaltsänderungsmitteilung in einem Cloud-Speichersystem, zugehöriger Cloud-Broker und Cloud-Agent

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